Alexei Volkov
Phenotypic plasticity is a concept that has been around for over a century, with biologists proposing its importance in evolution and the origin of novelty. The term was first used by Richard Woltereck in 1909 to describe the relationship between the expressions of phenotypes in different environments. Phenotypic plasticity refers to an organism's ability to modify its behavior, morphology, or physiology in response to environmental changes. It is a prominent research area in ecology and evolution, with a growing body of literature that has improved our understanding of organismal variation, adaptation, and speciation. The widespread interest in this topic has led to advancements in various fields, including biology, ecology, and evolution.
| Characteristics | Values |
|---|---|
| Definition | The property of organisms to produce distinct phenotypes in response to environmental variation |
| First use | Richard Woltereck in 1909 |
| Synonyms | Developmental plasticity, prenatal programming, fetal programming |
| Examples | Self-medication in vertebrates and invertebrates, leaf shape and size in plants, size of seeds in plants, timing of transition from vegetative to reproductive growth stage in plants, altitudinal migration in birds |
| Types | Temporal plasticity, non-adaptive plasticity, neutral plasticity |
| Importance | Facilitates novelty and diversity of traits, significant for immobile organisms, may be key to survival in the face of environmental change |
| Challenges | Vocabulary used in the premolecular era, lack of understanding of proximate mechanisms, controversy around plasticity |
| Research directions | Role of selection in adaptation of plastic traits, balance between ecological and evolutionary effects, integration of developmental and environmental approaches |
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What You'll Learn
- Phenotypic plasticity is a prominent focus of biological research
- The term was coined by Richard Woltereck in 1909
- It refers to an organism's ability to modify its phenotype in response to environmental changes
- Phenotypic plasticity is fundamental to how organisms cope with environmental variation
- It is considered a key mechanism for enabling organisms to survive in the face of environmental change
Phenotypic plasticity is a prominent focus of biological research
Phenotypic plasticity is a broad area of biological research that has been studied for over a century. It refers to the changes in an organism's behaviour, morphology, and physiology in response to a unique environment. Phenotypic plasticity is fundamental to the way organisms adapt to environmental variation, encompassing all types of environmentally induced changes (e.g. morphological, physiological, behavioural, phenological) that may or may not be permanent throughout an organism's lifespan.
The concept of phenotypic plasticity is especially prominent in the fields of ecology and evolution, with a vast body of literature that has enhanced our understanding of organismal variation, adaptation, and speciation. For instance, temporal plasticity, a type of phenotypic plasticity, involves the phenotypic change of organisms in response to short-term environmental changes over time. Animals exhibit physiological (reversible) and behavioural changes, while plants, being sedentary, exhibit physiological and developmental (non-reversible) changes.
Phenotypic plasticity is also observed in the self-medication practices of both vertebrates and invertebrates, which can be considered a form of adaptive plasticity. For example, various species of non-human primates infected with intestinal worms swallow rough, whole leaves that dislodge parasites from the intestine. The leaves also irritate the gastric mucosa, promoting the secretion of gastric acid and increasing gut motility, effectively eliminating the parasites.
Leaves are another example of phenotypic plasticity in action. Leaves grown in the light tend to be thicker, maximizing photosynthesis, and have a smaller area, aiding in cooling. Conversely, leaves grown in the shade are thinner and have a larger surface area to capture more light. Leaf shape is influenced by both genetics and the environment, with environmental factors such as light and humidity playing a significant role in leaf morphology.
Phenotypic plasticity is a universal property of living things, as all organisms respond to genes and the environment. It is considered "the rule rather than the exception" in biology. However, it has historically been challenging to study due to inconsistent terminology and the difficulty of controlling environmental variables in genetic experiments.
In conclusion, phenotypic plasticity is a prominent focus of biological research, particularly in ecology and evolution. Its study has enhanced our understanding of how organisms adapt to their environments, and it continues to be an active area of investigation, with ongoing efforts to develop more biologically relevant research directions.
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The term was coined by Richard Woltereck in 1909
The term "phenotypic plasticity" was coined by Richard Woltereck in 1909. Woltereck carried out the first experiments on plastic characters, using the water flea Daphnia to describe the relationship between the expressions of phenotypes across various environments. However, he did not properly define phenotypes, and it was not until 1911 that Johannsen distinguished between genotype and phenotype and introduced the concept of genotype-environmental interaction.
Woltereck's early work on phenotypic plasticity laid the foundation for further research and understanding in this field. Phenotypic plasticity refers to the changes in an organism's behavior, morphology, and physiology in response to its unique environment. It is considered fundamental to how organisms adapt to environmental variations and is observed in almost every group of plants and animals.
The concept of phenotypic plasticity is especially relevant in the context of evolutionary biology. It is a mechanism by which organisms modify their phenotype to survive in changing environments. This modification can occur at different levels, from molecules to organ systems, and is influenced by various factors such as hormones and neuroendocrine stress responses.
While Woltereck introduced the term, the phenomenon of phenotypic plasticity has been studied and discussed by many scientists over the years. The term "developmental plasticity" is often used interchangeably with phenotypic plasticity, recognizing that plasticity is often a developmental phenomenon. Other terms like "prenatal programming" or "fetal programming" refer to the effects of early life experiences on later life phenotypic expression.
In summary, Richard Woltereck's coinage of the term "phenotypic plasticity" in 1909 marked a significant step in the study of biology and evolution. His work initiated a long line of inquiry into how organisms adapt and respond to their environments, leading to the rich and diverse field of research we see today.
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It refers to an organism's ability to modify its phenotype in response to environmental changes
Phenotypic plasticity refers to an organism's ability to modify its phenotype in response to environmental changes. It is a mechanism for organisms to survive in the face of environmental variation and is found in all domains of life. While the idea of phenotypic plasticity has been proposed by biologists for over a century, the term was first introduced in 1909 by Richard Woltereck, who carried out the first experiments on plastic characters using the water flea Daphnia to describe the relationship between phenotype expressions across different environments. He coined the term "reaction norm", which later became the foundation for the concept of phenotypic plasticity.
Phenotypic plasticity encompasses all types of environmentally induced changes, such as morphological, physiological, behavioural, and phenological alterations. These changes can be observed in almost every group of plants and animals. For example, in response to intestinal worms, various species of non-human primates engage in leaf-swallowing, which helps dislodge parasites from the intestine. This behaviour is considered a form of adaptive plasticity. Another example is the alteration of leaf shape, size, and thickness in plants according to light levels. Leaves grown in direct light tend to be thicker and have a smaller area, while those grown in shaded environments are thinner and have a larger surface area to capture limited light.
The magnitude of thermal variation is believed to be directly proportional to an organism's plastic capacity. This idea, known as the "climatic variability hypothesis", suggests that species from variable temperate habitats have a higher capacity for phenotypic plasticity compared to those from constant tropical climates. However, some studies, such as those on Drosophila species, have failed to find a clear pattern of plasticity over latitudinal gradients, indicating that this hypothesis may not universally apply.
Phenotypic plasticity plays a significant role in the evolution of novel traits and the diversification of organisms. It is particularly relevant in the context of global change and climate change, as it allows organisms to adapt to new environments and survive. However, there are also constraints and costs associated with the evolution of phenotypic plasticity. For instance, some forms of plasticity, such as learning, may come at a high cost. Additionally, the rarity or novelty of an environment can strongly influence the evolution of plasticity, as it may lead to the emergence of cryptic genetic variation and impact the intensity and response to selection.
While the concept of phenotypic plasticity has been recognised for a long time, recent advancements in theoretical and empirical studies have shed new light on its significance. This has led to a growing interest in the topic, particularly in the fields of ecology and evolution, with a vast literature contributing to our understanding of organismal variation, adaptation, and speciation.
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Phenotypic plasticity is fundamental to how organisms cope with environmental variation
Phenotypic plasticity is defined as the property of organisms to produce distinct phenotypes in response to environmental variation. It is fundamental to how organisms cope with environmental variation, encompassing all types of environmentally induced changes (e.g. morphological, physiological, behavioural, phenological) that may or may not be permanent throughout an individual's lifespan.
The concept of phenotypic plasticity was first introduced in 1909 by Richard Woltereck, who used the water flea Daphnia to describe the relationship between the expressions of phenotypes across a range of different environments. He coined the term "reaction norm" to describe this phenomenon, which refers to the consistent expression of phenotypes in different environments. However, it was not until 1911 that Johannsen first distinguished between genotype and phenotype and introduced the concept of genotype-environmental interaction.
Phenotypic plasticity is particularly important for immobile organisms such as plants, which cannot move to new locations in response to environmental changes. For example, plants may alter the allocation of resources to their roots when soils contain low concentrations of nutrients, or they may modify the size and shape of their leaves depending on the light levels available for photosynthesis.
Temporal plasticity, a type of phenotypic plasticity, involves the phenotypic change of organisms in response to short-term environmental changes over time. Animals typically exhibit reversible physiological and behavioural changes, while plants show irreversible physiological and developmental changes. Temporal plasticity is considered adaptive when the phenotypic response results in increased fitness for the organism.
Phenotypic plasticity is also observed in the behaviour of both vertebrates and invertebrates, which practice self-medication in response to infection. For example, various species of non-human primates infected with intestinal worms engage in leaf-swallowing, which helps to dislodge parasites from the intestine.
The widespread interest in phenotypic plasticity has made it a prominent focus of biological research, particularly in the fields of ecology and evolutionary biology. While it was once considered a "nuisance", the importance of phenotypic plasticity in facilitating the novelty and diversity of traits is now recognised. Phenotypic plasticity is expected to play an increasingly important role in helping organisms cope with the unprecedented rates of climate change predicted to occur in the coming decades.
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It is considered a key mechanism for enabling organisms to survive in the face of environmental change
Phenotypic plasticity is a key mechanism that enables organisms to survive in the face of environmental change. It refers to the changes in an organism's behaviour, morphology, and physiology in response to a unique environment. This phenomenon has been observed in almost every group of plants and animals.
The concept of phenotypic plasticity is fundamental to understanding how organisms cope with environmental variation. It encompasses all types of environmentally induced changes, such as morphological, physiological, behavioural, and phenological alterations. These changes may or may not be permanent throughout an individual organism's lifespan. For example, plants exhibit phenotypic plasticity by altering the size and thickness of their leaves depending on the light levels. Leaves grown in direct light tend to be thicker and have a smaller area, while those grown in shaded environments are thinner and have a larger surface area.
Temporal plasticity, a type of phenotypic plasticity, involves the phenotypic change of organisms in response to short-term environmental changes over time. Animals exhibit physiological and behavioural changes, while plants, being sedentary, exhibit physiological and developmental (non-reversible) changes. Temporal plasticity is considered adaptive when the phenotypic response results in increased fitness.
The evolution of phenotypic plasticity is a complex process influenced by various factors. Biologists have proposed that phenotypic plasticity plays a significant role in evolution and the origin of novelty. However, the idea has remained contentious due to the inconsistent vocabulary used in the premolecular era. Additionally, there are potential costs associated with phenotypic plasticity, such as the lack of ability to produce an optimal trait, which may constrain its evolution.
Despite these complexities, the study of phenotypic plasticity is crucial, especially in light of climate change. It provides insights into how organisms adapt to new environments and facilitates the understanding of organismal variation, adaptation, and speciation.
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Frequently asked questions
Phenotypic plasticity refers to the changes in an organism's behaviour, morphology, and physiology in response to a unique environment.
Phenotypic plasticity can be observed as changes in behaviour. For example, in response to infection, vertebrates and invertebrates practice self-medication, which is considered a form of adaptive plasticity.
The environment experienced by a developing organism often has profound effects on phenotypic expression. This is known as phenotypic plasticity.
The term developmental plasticity is often used in place of phenotypic plasticity to recognise that plasticity is often a developmental phenomenon.
The term "phenotypic plasticity" was first used in 2001 by Pigliucci.
